Chair frame design



FIG. 1 is a perspective view of a chair frame design showing my new design, it being understood that the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof. (The left side elevational view thereof is the exact mirror image of the right side shown in FIG. 4);

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a chair frame design, as shown and described. 